BLOOD TEST · SMART CARE POLYCLINIC, DEIRA
Rheumatoid Factor explained
An antibody associated with rheumatoid arthritis — supporting evidence rather than a diagnosis.
What the Rheumatoid Factor test measures
An antibody the immune system can produce against the body's own tissue. Measured when joint pain, stiffness or swelling raises the question of inflammatory arthritis rather than wear and tear. It is one scored element among several, not a diagnosis: the ACR/EULAR classification criteria combine it with joint involvement, other antibodies, inflammatory markers and duration — and it can be positive in people with no arthritis at all.1
What the result tells you
Positive, with matching symptoms
Supports rheumatoid arthritis — typically morning stiffness lasting an hour or more, in the small joints of hands and feet, on both sides.
It is not a screening test
A positive in someone with no joint symptoms usually means nothing, and positives become more common with age in healthy people.
A negative does not exclude it
Plenty of people with rheumatoid arthritis test negative, which is why the diagnosis is never made or dismissed on this alone.
How it is actually used
As one piece of evidence beside the pattern of joints involved, the ESR, the examination and often imaging.
How to prepare
- Fasting
- Not needed
- Best time
- Any time of day
What can move the result
A result outside the usual range does not on its own mean something is wrong. These are the everyday explanations a doctor considers first.
Packages that include it
Frequently asked questions
An antibody the immune system can produce against the body's own tissue. Measured when joint pain, stiffness or swelling raises the question of inflammatory arthritis rather than wear and tear. It is one scored element among several, not a diagnosis: the ACR/EULAR classification criteria combine it with joint involvement, other antibodies, inflammatory markers and duration — and it can be positive in people with no arthritis at all. Positive, with matching symptoms: Supports rheumatoid arthritis — typically morning stiffness lasting an hour or more, in the small joints of hands and feet, on both sides.
Fasting: Not needed. Best time: Any time of day.
Commonly: rheumatoid arthritis; age, as positives become more common in healthy older people; other autoimmune conditions; some chronic infections; long-term smoking. A single result is not a diagnosis. Values are read against the laboratory's own reference range and alongside your history, your symptoms and the rest of the panel — which is why every package includes a doctor to go through them with you.
At Smart Care Polyclinic, 29 Doha Centre, Al Maktoum Rd, Deira, Dubai. It is included in the Smart Total Health, the Smart Total Health 360°, the Smart Extra Health, or it can be ordered on its own. Walk in during opening hours or call +971 (0)4 379 3562.
Sources
Written from current guidance and reviewed 31 August 2026.
Sources cited above
- Aletaha D, Neogi T, Silman AJ, Funovits J, et al.. 2010 Rheumatoid arthritis classification criteria: an American College of Rheumatology/European League Against Rheumatism collaborative initiative. Arthritis and Rheumatism. 2010;62(9):2569-81. PMID 20872595. doi:10.1002/art.27584The ACR/EULAR classification criteria for rheumatoid arthritis, in which rheumatoid factor is one scored element among several rather than a diagnosis on its own.
Sources are listed for the specific statements they support. They are published research and guidance, not a substitute for a consultation — what applies to you is decided by a doctor who has assessed you.
- Rheumatoid factor (RF) testMedlinePlus, US National Library of Medicine
- Rheumatoid arthritis in adults: managementNICE
- Rheumatoid arthritisNHS